Add getter for increment on Inc instruction

Fixed: b/286146481
Change-Id: Ic97d096f9d36622cc64737923d8cadf05f53bf82

src/main/java/com/android/tools/r8/ir/code/Inc.java

diff --git a/src/main/java/com/android/tools/r8/ir/code/Inc.java b/src/main/java/com/android/tools/r8/ir/code/Inc.java
index 72b2bf2..5d3a877 100644
--- a/src/main/java/com/android/tools/r8/ir/code/Inc.java
+++ b/src/main/java/com/android/tools/r8/ir/code/Inc.java
@@ -33,6 +33,10 @@
     return Opcodes.INC;
   }
 
+  public int getIncrement() {
+    return increment;
+  }
+
   @Override
   public <T> T accept(InstructionVisitor<T> visitor) {
     return visitor.visit(this);